SOHC - Xtreme Energy: Mild Street performance, 3.23-3.55 gears. Good torque and power, noticeable idle. Requires custom tuning. ; 268/274 Advertised Duration, 230/236 Duration .050", .500"/.500" Lift, 114 Lobe Separation; Requires cam gear set part #10246SET; Requires part #26113-16 valve springs and either 792-16 steel retainers or 791-16 titanium retainers; Part #26125-16 high load valve springs also available